linux-kernel - Re: [PATCH v16 1/6] efi: ARM/arm64: ignore DT memory nodes instead of removing them

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Date:	Fri, 15 Apr 2016 16:06:08 +0200
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	Will Deacon <will.deacon@....com>
Cc:	David Daney <ddaney.cavm@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Rob Herring <robh+dt@...nel.org>,
	Frank Rowand <frowand.list@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Ganapatrao Kulkarni <gkulkarni@...iumnetworks.com>,
	Robert Richter <rrichter@...ium.com>,
	Matt Fleming <matt@...eblueprint.co.uk>,
	Mark Rutland <mark.rutland@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	David Daney <david.daney@...ium.com>
Subject: Re: [PATCH v16 1/6] efi: ARM/arm64: ignore DT memory nodes instead of
 removing them

On 15 April 2016 at 16:03, Will Deacon <will.deacon@....com> wrote:
> On Fri, Apr 08, 2016 at 03:50:23PM -0700, David Daney wrote:
>> From: Ard Biesheuvel <ard.biesheuvel@...aro.org>
>>
>> There are two problems with the UEFI stub DT memory node removal
>> routine:
>> - it deletes nodes as it traverses the tree, which happens to work
>>   but is not supported, as deletion invalidates the node iterator;
>> - deleting memory nodes entirely may discard annotations in the form
>>   of additional properties on the nodes.
>>
>> Since the discovery of DT memory nodes occurs strictly before the
>> UEFI init sequence, we can simply clear the memblock memory table
>> before parsing the UEFI memory map. This way, it is no longer
>> necessary to remove the nodes, so we can remove that logic from the
>> stub as well.
>>
>> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
>> Signed-off-by: David Daney <david.daney@...ium.com>
>> ---
>>  drivers/firmware/efi/arm-init.c    |  8 ++++++++
>>  drivers/firmware/efi/libstub/fdt.c | 24 +-----------------------
>>  2 files changed, 9 insertions(+), 23 deletions(-)
>
> Matt, are you ok with me taking this through the arm64 tree? (since the
> NUMA patches depend on it). If so, please can I have your ack?
>

Matt gave his Reviewed-by for v15

http://www.gossamer-threads.com/lists/linux/kernel/2390242